Construction method of end bearing pile foundation for borehole backfilling: Fid-Bau Portal

Construction method of end bearing pile foundation for borehole backfilling

CHENG YI / DENG XIAOGANG / HU YAXIN / MAO SHENGYUN / PENG RUOHONG

The invention relates to an end bearing pile foundation for borehole backfilling and a construction method thereof. The construction method comprises the following steps of S1, opening a pile hole inthe ground, wherein the opened pile hole is gradually and stepwise shrunk from top to bottom; S2, placing a plurality of guiding rings in the pile hole, wherein the plurality of guiding rings are respectively arranged at the step junctions and the inner walls of the guiding rings are obliquely arranged from top to bottom; S3, placing a steel casing in the pile hole, wherein the outer diameter of the steel casing is equal to the minimum section size of the pile hole; S4, backfilling broken stones between the steep casing and the inner wall of the pile hole; S5, dumping a cement mixture in the steel casing, wherein the filling height, in the steel casing, of the cement mixture is not higher than three quarters to four fifths of the height of the steel casing, and before the cement mixture issolidified, a precast pile body is hit into the steel casing through hammering; and S6, backfilling soil between the inner part of the steel casing and the steel casing and the pile hole and carryingout compaction after the cement mixture in the steel casing is solidified. The construction method has the effect of improving the construction precision of the precast pile body.

本发明涉及钻孔回填端承桩基础及其施工方法，其包括以下步骤：S1、在地面上开出桩孔，且开出的桩孔从上至下呈阶梯状逐渐缩小；S2、在桩孔内放置多个引导环，多个引导环分别设置于桩孔的阶梯交接处，引导环的内壁从上至下呈倾斜设置；S3、往桩孔内放入钢护筒，且钢护筒的外径与桩孔的最小截面尺寸相等；S4、在钢护筒与桩孔的内壁之间回填碎石；S5、在钢护筒的内部倾倒水泥拌合物，水泥拌合物在钢护筒内的填充高度不高于钢护筒高度的四分之三至五分之四，在水泥拌合物凝固前通过锤击往钢护筒内部打入预制桩本体；S6、待钢护筒内的水泥拌合物凝固后，在钢护筒内部以及钢护筒和桩孔之间回填土并压实，本发明具有提高预制桩本体的施工精度的效果。

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